For example: Sheldon,Today at 9:54 AM, Report
Would be: Sheldon (Lame),Today at 9:54 AM, Report
Extra (not necessary): When we see the user's name on our Lame list, there should be a link to the post that we've marked them as lame in.
Extra (not necessary): Our list of lames could be shown on our profile page but as a privacy option, (public, private, only followed users can view, only users we followed can view).
Random: This addon would be perfect to use in conjunction with @Syndol bookmark addon because not only can we mark a user as Lame we'd be able to bookmark all the posts that got him on our Lame list. We can create a bookmark prefix called Lame and add their troll posts there.
Miscellaneous: This addon sorta does what I want but only the admin can mark a user.